Re: [PATCH v2] unix: properly account for FDs passed over unix sockets

[David Miller]

From: Willy Tarreau <w@xxxxxx>
Date: Sun, Jan 10 07:54:56 CET 2016

> It is possible for a process to allocate and accumulate far more FDs than
> the process' limit by sending them over a unix socket then closing them
> to keep the process' fd count low.
> 
> This change addresses this problem by keeping track of the number of FDs
> in flight per user and preventing non-privileged processes from having
> more FDs in flight than their configured FD limit.
> 
> Reported-by: socketpair@xxxxxxxxx
> Reported-by: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
> Mitigates: CVE-2013-4312 (Linux 2.0+)
> Suggested-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
> Acked-by: Hannes Frederic Sowa <hannes@xxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Willy Tarreau <w@xxxxxx>

Applied and queued up for -stable, thanks!